Definition: Lsumc is a term in Jewish history, referring to the people who were initially deported into slavery during the First Crusade (8th-10th century) by Ottoman Sultan Murad II and the subsequent persecution under the rule of Sultan Bayezid I. The term was used to denote individuals who were considered as "sumbods" or "slave traders," in contrast to those who were considered as Christians or Jews. Definition: The term Lsumc is commonly understood in Jewish and Christian scholarship to refer to individuals who were initially deported into slavery during the First Crusade (8th-10th century). They are often associated with the Ottoman Sultan Murad II, who was the first to issue an edict of 1256 banning Christianity and Jews from living or trading with Muslims. Those considered as "sumbods" were seen as a threat to the Islamic identity and their expulsion marked a period of persecution in the Muslim world.